Here are a few things I noticed about the product.Positive:- Works exactly how it should work.- I dont know about other units by my unit is spot on. I have a thermometer that logs the highest and lowest temperature in a 24 hr period. I set the thermostat at 66C and logged the temperature.I was between 65C-69C over a preiod of few hours, that was pretty impressive.- You will be happy with the results!Negatives (But I can live with)- I am giving 5 stars becuase I really liked the product but here are some things you should be aware of. The sensor is not the prettiest thing that you would see, it is a tad bigger than my liking(you can google the datasheet specs). The sensor is held by a copper spiral coil which seems to have some fluid in it. You have to be cautious handling it.You cannot bend the copper wire any way you feel like.Overall, I did not want to drill a hole in my fridge and I was able to tape the sensor in the fridge wall and route out the cable. It is not extremely pretty but looks ok and does the job exellently.